Scott Leshinski - 01 Jan 2026 Form 4 Insider Report for OneStream, Inc. (OS)

Role: President
Signature: /s/ Holly Koczot, attorney-in-fact
Issuer symbol: OS
Transactions as of: 01 Jan 2026
Net transactions value: $0
Form type: 4
Filing time: 05 Jan 2026, 16:24:08 UTC
Next filing: 12 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Leshinski Scott	President	C/O ONESTREAM, INC., 191 N. CHESTER STREET, BIRMINGHAM	/s/ Holly Koczot, attorney-in-fact	05 Jan 2026	0002098850

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	OS	Class A Common Stock	Award	$0	+149,202	+104%	$0.000000	291,981	01 Jan 2026	Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents an equal number of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock on the date it vests. The RSUs will vest as to 1/16th of the shares subject to the RSUs on each Quarterly Vesting Date (defined below) beginning on March 10, 2026, subject to the Reporting Person continuing to be a service provider through such date. "Quarterly Vesting Date" means March 10, June 10, September 10 and December 10 of each year.
F2	The shares reported include unvested restricted stock units.

Content

Represents an equal number of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock on the date it vests. The RSUs will vest as to 1/16th of the shares subject to the RSUs on each Quarterly Vesting Date (defined below) beginning on March 10, 2026, subject to the Reporting Person continuing to be a service provider through such date. "Quarterly Vesting Date" means March 10, June 10, September 10 and December 10 of each year.

The shares reported include unvested restricted stock units.